//   Copyright 2012 Georg-August-Universität Göttingen, Germany
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package de.ugoe.cs.autoquest.plugin.jfc.guimodel;

import de.ugoe.cs.autoquest.eventcore.guimodel.AbstractDefaultGUIElement;
import de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement;
import de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElementSpec;
import de.ugoe.cs.autoquest.eventcore.guimodel.IGUIView;

/**
 * <p>
 * Base class for all JFC GUI elements.
 * </p>
 * 
 * @version 1.0
 * @author Patrick Harms
 */
public class JFCGUIElement extends AbstractDefaultGUIElement {

    /**
     * <p>
     * Id for object serialization.
     * </p>
     */
    private static final long serialVersionUID = 1L;

    /**
     * <p>
     * the default distance value for different applications
     * </p>
     */
    protected static final double DISTANCE_DISTINCT_APPLICATION = 1.0;

    /**
     * <p>
     * the default distance value for same application but different views, i.e., dialogs, frames,
     * or tabbed panes
     * </p>
     */
    protected static final double DISTANCE_SAME_APPLICATION = 0.75;

    /**
     * <p>
     * the default distance value for same view but different panels
     * </p>
     */
    protected static final double DISTANCE_SAME_VIEW = 0.5;

    /**
     * <p>
     * the default distance value for same parent panel but different GUI elements 
     * </p>
     */
    protected static final double DISTANCE_SAME_PANEL = 0.2;

    /**
     * <p>
     * the default distance value for identical GUI elements
     * </p>
     */
    protected static final double DISTANCE_NONE = 0.0;

    /**
     * <p>
     * Specification of the GUI Element
     * </p>
     */
    private JFCGUIElementSpec specification;

    /**
     * <p>
     * Constructor. Creates a new JFCGUIElement.
     * </p>
     * 
     * @param specification
     *            specification of created GUI element
     * @param parent
     *            parent of the created GUI element; null means that the element is a top-level
     *            window
     */
    public JFCGUIElement(JFCGUIElementSpec specification, JFCGUIElement parent) {
        super(specification, parent);
        this.specification = specification;
    }

    /*
     * (non-Javadoc)
     * 
     * @see de.ugoe.cs.autoquest.eventcore.IEventTarget#getPlatform()
     */
    @Override
    public String getPlatform() {
        return "JFC";
    }

    /**
     * <p>
     * Returns the type of the GUI element, i.e., the name of its Java class.
     * </p>
     * 
     * @return the Java class name
     */
    public String getJavaType() {
        return specification.getType();
    }

    /**
     * <p>
     * Returns the name of the GUI element.
     * </p>
     * 
     * @return the name
     */
    public String getName() {
        return specification.getName();
    }

    /**
     * <p>
     * Returns the icon of the GUI element.
     * </p>
     * 
     * @return the icon
     */
    String getIcon() {
        return specification.getIcon();
    }

    /**
     * <p>
     * Returns the index of the GUI element.
     * </p>
     * 
     * @return the index
     */
    int getIndex() {
        return specification.getIndex();
    }

    /**
     * <p>
     * Returns the object hash of the GUI element.
     * </p>
     * 
     * @return the object hash
     */
    int getElementHash() {
        return specification.getElementHash();
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#updateSpecification(de.ugoe.cs.autoquest
     * .eventcore .guimodel.IGUIElementSpec)
     */
    @Override
    public void updateSpecification(IGUIElementSpec updateSpecification) {
        if (updateSpecification instanceof JFCGUIElementSpec) {
            specification.update(((JFCGUIElementSpec) updateSpecification));
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    @Override
    public String getStringIdentifier() {
        String str = this.toString();
        if (getParent() != null) {
            return str + "<-" + getParent().getStringIdentifier();
        }
        return str;
    }

    public String getJacaretoHierarchy() {
        String str;

        // get the Java classname, ignore the package hierarchy if present
        String[] parts = getSpecification().getType().split("\\.");

        // find the correct Jacareto index
        // jacareto indices start at 1
        int jacIndex = ((JFCGUIElementSpec) getSpecification()).getAltIndex() + 1;
        str = parts[parts.length - 1] + "_(" + jacIndex + ")";

        if (getParent() != null) {
            return ((JFCGUIElement) getParent()).getJacaretoHierarchy() + "." + str;
        }
        return str;
    }

    public String getJacaretoRoot() {
        return getJacaretoHierarchy().split("\\.")[0];
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        String str =
            getElementDescriptor() + "(" + getName() + "," + getElementHash() + "," + getIcon() +
                "," + getIndex() + ")";
        return str;
    }

    /* (non-Javadoc)
     * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#getView()
     */
    @Override
    public IGUIView getView() {
        JFCGUIElement element = this;
        
        while ((element != null) && (!(element instanceof JFCFrame)) &&
               (!(element instanceof JFCDialog)))
        {
            if (!(element.getParent() instanceof JFCTabbedPane)) {
                element = (JFCGUIElement) element.getParent();
            }
            else {
                // break, as all children of a tabbed pane are always views
                break;
            }
        }
        
        return new JFCView(element);
    }

    /*
     * (non-Javadoc)
     * 
     * @see de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement#getDistanceTo(IGUIElement)
     */
    @Override
    public double getDistanceTo(IGUIElement otherElement) {
        if (otherElement instanceof JFCGUIElement) {
            if (equals(otherElement)) {
                return DISTANCE_NONE;
            }
            
            if (!areInSameView(this, otherElement)) {
                IGUIElement root1 = this;
                
                while (root1.getParent() != null) {
                    root1 = root1.getParent();
                }
                
                IGUIElement root2 = otherElement;
                
                while (root2.getParent() != null) {
                    root2 = root2.getParent();
                }
                
                if (!root1.equals(root2)) {
                    return DISTANCE_DISTINCT_APPLICATION;
                }
                else {
                    return DISTANCE_SAME_APPLICATION;
                }
            }
            else {
                // check if they have the same parent panel. If so, they are very close.
                // If not, they may be structured completely differently
                IGUIElement parentPanel1 = this;
                
                while (parentPanel1 != null) {
                    if ((parentPanel1 instanceof JFCPanel) ||
                        (parentPanel1 instanceof JFCFrame) ||
                        (parentPanel1 instanceof JFCDialog) ||
                        (parentPanel1 instanceof JFCCanvas) ||
                        (parentPanel1 instanceof JFCMenu) ||
                        (parentPanel1 instanceof JFCScrollPane) ||
                        (parentPanel1 instanceof JFCSplitPane) ||
                        (parentPanel1 instanceof JFCTabbedPane))
                    {
                        break;
                    }
                    else {
                        parentPanel1 = parentPanel1.getParent();
                    }
                }
                
                IGUIElement parentPanel2 = otherElement;
                
                while (parentPanel2 != null) {
                    if ((parentPanel2 instanceof JFCPanel) ||
                        (parentPanel2 instanceof JFCFrame) ||
                        (parentPanel2 instanceof JFCDialog) ||
                        (parentPanel2 instanceof JFCCanvas) ||
                        (parentPanel2 instanceof JFCMenu) ||
                        (parentPanel2 instanceof JFCScrollPane) ||
                        (parentPanel2 instanceof JFCSplitPane) ||
                        (parentPanel2 instanceof JFCTabbedPane))
                    {
                        break;
                    }
                    else {
                        parentPanel2 = parentPanel2.getParent();
                    }
                }
                
                // a check for the identity of the objects is sufficient. That they resist on the
                // same document was checked beforehand. So even a condense of the GUI model should
                // not cause an invalid result here.
                if ((parentPanel1 == parentPanel2) ||
                    ((parentPanel1 != null) && (parentPanel1.equals(parentPanel2))))
                {
                    return DISTANCE_SAME_PANEL;
                }
                else {
                    return DISTANCE_SAME_VIEW;
                }
            }
        }
        
        return DISTANCE_DISTINCT_APPLICATION;
    }

    /**
     * <p>
     * A short string describing the GUI element, e.g., Button, Canvas, or ScrollBar.
     * </p>
     * 
     * @return short element descriptor
     */
    protected String getElementDescriptor() {
        return "Default";
    }

    /**
     * <p>
     * convenience method to check if two GUI elements are in the same view. In contrast to other
     * technologies, JFC GUI views may have other views as children. Hence, it is not sufficient to
     * check, if the direct parent views are identical.
     * </p>
     */
    private boolean areInSameView(IGUIElement guiElement1, IGUIElement guiElement2) {
        IGUIView view1 = guiElement1.getView();
        IGUIElement other = guiElement2;
        
        while (other != null) {
            if (view1.equals(other.getView())) {
                return true;
            }
            
            other = other.getParent();
        }
        
        // the parent views of the other gui element are checked. But not the ones of this. Hence,
        // check also them.
        if ((view1 instanceof JFCView) && (((JFCView) view1).getParent() != null)) {
            return areInSameView(((JFCView) view1).getParent(), guiElement2);
        }
        else {
            return false;
        }
    }
}